mutcd

reference corpus · status live · domain OPS (Production and incident knowledge) · lane A · refresh pinned · tags US · TRAFFIC · OPERATIONS

What an agent uses it for

the current MUTCD: sign and signal warrants, markings, work-zone typical applications

Use it
xerj corpus add --from https://raw.githubusercontent.com/xerj-org/xerj/corpus-hub/tools/xerj-code/hub/mutcd.json
xerj corpus index mutcd then xerj code mutcd "your question"

Sources and pins

source	pin	licence	size	review note
corpus-mutcd	b70b91886a80	US-government public domain (FHWA/DOT, 17 USC 105)	33.3 MB / 960 files	FHWA MUTCD 11th Edition with Revision 1 (December 2025) - the edition mutcd.fhwa.dot.gov currently distributes (source page + PDF sha256 pinned in the mirror README). PDF-only lane (FHWA stopped publishing HTML with the 11th edition), extracted with pypdf and split per section: 960 files across sections/chapters, front matter and appendices. G7 graded 2026-10-04: 4/5 pass 4/5 relevant (full-stop w

33.3 MB across 960 files. Added 2026-10-04.

Rights

US-government public domain (FHWA/DOT, 17 USC 105). Redistribution permitted with attribution per the licence review. The review block records a human opening each licence file at the pin. Detector output is a hint, never the verdict.

Retrieval spot-check (G7)

4.0/5 relevant. Graded .

Q: when is a STOP sign required at an intersection
expect: sections/sec-2b-04.txt
top-5: corpus-mutcd/sections/sec-4a-04.txt / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-2b-04.txt / corpus-mutcd/sections/sec-3b-19.txt:32
grade: pass

Q: how to choose which road gets the STOP or YIELD sign
expect: sections/sec-2b-07.txt
top-5: corpus-mutcd/sections/sec-9b-02.txt:1 / corpus-mutcd/sections/sec-8c-03.txt:1 / corpus-mutcd/sections/sec-3b-19.txt:1 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf
grade: miss

Q: peak hour signal warrant what is it for
expect: sections/sec-4c-04.txt
top-5: corpus-mutcd/sections/sec-4c-04.txt / corpus-mutcd/sections/sec-4c-09.txt / corpus-mutcd/front-matter/toc-and-lists.txt / corpus-mutcd/front-matter/toc-and-lists.txt / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf
grade: pass

Q: pavement markings for a two-way left-turn lane
expect: sections/sec-3b-05.txt
top-5: corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-2b-32.txt / corpus-mutcd/sections/sec-3b-05.txt:1 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-3b-05.txt:92
grade: pass

Q: dilemma zone high speed approaches yellow change interval
expect: sections/sec-4d-01.txt
top-5: corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-4d-01.txt / corpus-mutcd/sections/sec-6l-04.txt:62 / corpus-mutcd/downloads/mutcd11theditionr1hl.pdf / corpus-mutcd/sections/sec-4j-03.txt:62
grade: pass